Surface pattern applied to a light bulb



FIG. 1 is a perspective view of a light bulb showing the new surface pattern design applied thereon;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines illustrating the light bulb form no part of the claimed design. 

The ornamental design for a surface pattern applied to a light bulb, as shown and described. 